fuzz validate; trimpath

[markphelps]

• Adds fuzz testing for validateAttachment
• Adds trimpath flag for go build
• Renames MAX_VARIANT_ATTACHMENT_SIZE to maxVariantAttachmentSize

[codecov-commenter]

Codecov Report

Merging #722 (ba7b956) into master (c4836f5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #722   +/-   ##
=======================================
  Coverage   82.56%   82.56%           
=======================================
  Files          19       19           
  Lines        1709     1709           
=======================================
  Hits         1411     1411           
  Misses        249      249           
  Partials       49       49           

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